At the Kage summit his shunshin speed was revealed to be at least on par with V1 Ay so he's at least a tier if not more above Kimimaros best feat. His attack speed was also on par with Ays too and that also beats Kimimaros best attack speed feat.
Just like what Proof said, shunshin isn't enough to take down Kimmi. In fact, Kimmi was able to dodge a FRS a low-mid range[
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], which is very impressive to do, so that alone isn't going to help.
And how fast is Ay and Darui attack speed, when it was interpret by Juugo and Suigetsu